#include "apue.h"
#include <sys/times.h>

static void pr_times(clock_t, struct tms*, struct tms*);
static void do_cmd(char*);

void pr_exit(int status)
{

    if (WIFEXITED(status))
        printf("normal termination , exut status = %d\n", WEXITSTATUS(status));
    else if (WIFSIGNALED(status))

        printf("normal termination , exut status = %d\n", WTERMSIG(status)
#ifdef WCOREDUMP
                                                              ,
               WCOREDUMP(status) ? " (core file generated)" : "");
#else
        );
#endif

    else if (WIFSTOPPED(status))
        printf("child stopped, signal number = %d\n", WSTOPSIG(status));
}

int main(int argc, char* argv[])
{
    int i;

    setbuf(stdout, NULL);
    for (i = 1; i < argc; i++)
        do_cmd(argv[i]); /* once for each command-line arg */
    exit(0);
}

static void do_cmd(char* cmd) /* execute and time the "cmd" */
{
    struct tms tmsstart, tmsend;
    clock_t start, end;
    int status;

    printf("\ncommand: %s\n", cmd);

    if ((start = times(&tmsstart)) == -1) /* starting values */
        err_sys("times error");

    if ((status = system(cmd)) < 0) /* execute command */
        err_sys("system() error");

    if ((end = times(&tmsend)) == -1) /* ending values */
        err_sys("times error");

    pr_times(end - start, &tmsstart, &tmsend);
    pr_exit(status);
}

static void pr_times(clock_t real, struct tms* tmsstart, struct tms* tmsend)
{
    static long clktck = 0;

    if (clktck == 0) /* fetch clock ticks per second first time */
        if ((clktck = sysconf(_SC_CLK_TCK)) < 0)
            err_sys("sysconf error");

    printf("  real:  %7.2f\n", real / (double)clktck);
    printf("  user:  %7.2f\n", (tmsend->tms_utime - tmsstart->tms_utime) / (double)clktck);
    printf("  sys:   %7.2f\n", (tmsend->tms_stime - tmsstart->tms_stime) / (double)clktck);
    printf("  child user:  %7.2f\n", (tmsend->tms_cutime - tmsstart->tms_cutime) / (double)clktck);
    printf("  child sys:   %7.2f\n", (tmsend->tms_cstime - tmsstart->tms_cstime) / (double)clktck);
}
